upper

the higher of two berths

piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot; "Uppers come in many styles"

a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

the topmost one of two

higher in place or position; "the upper bunk"; "in the upper center of the picture"; "the upper stories"

superior in rank or accomplishment; "the upper half of the class"